MDCB Practice Set 1 - Test 3 Questions

MDCB Practice Set 1 - Test 3 Questions with Complete Solutions (Latest 2025)

• As the energy of the parallel-opposed x-rays beams of

same energy increases, it will lead to:

• decreased dose at midplane.
• decreased skin dose.
• increased dose in build-up region.
• increased dose at Dmax. - Correct Answers ✅B
• In the small volume treatment of bladder cancer with

radiation therapy, the patient should be

treated with:

• a full bladder in order to spare as much small bowel as

possible.

• a full bladder in order to spread the dose evenly to the

tumor.

• an empty bladder in order to encompass tumor with

reproducibility.

• an empty bladder in order to minimize bleeding

complications. - Correct Answers ✅C

• Although they receive the same dose, some tissues exhibit

acute radiation damage earlier than

others because they have a:

• smaller number of metabolizing cells.
• reduced blood flow.
• lower number of hypoxic cells. 1 / 2

MDCB Practice Set 1 - Test 3 Questions with Complete Solutions (Latest 2025)

• higher mitotic index. - Correct Answers ✅D
• A 20 cm diameter patient is treated to midplane by using a

100 cm source-to-axis distance (SAD) technique. If the same patient is then treated by using a 100 cm source-to-surface distance (SSD) technique, the monitor units would increase

by approximately:

A. 10%.

B. 15%.

C. 21%.

• 25%. - Correct Answers ✅C
• According to the NCRP Report #116, the annual effective

dose limit for continuous exposure to

the whole body for the general public is:

• 0.5 mSv (0.05 rem).
• 1.0 mSv (0.10 rem).
• 15.0 mSv (1.50 rem).
• 75.0 mSv (7.50 rem). - Correct Answers ✅B
• Unless otherwise permitted by the NRC, brachytherapy

needles and tubes must be leak tested

by the user at intervals NOT to exceed:

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